Why not go ahead and build the Hyperloop, and when CA HSR gets around to actually building the links into downtown LA and SF, design them to connect up to the Hyperloop, which will surely be complete and running by the time HSR is projected to be available. The Hyperloop can even share some rights of way with HSR. Why not have both?
Hyperloop should be an AND proposition to HSR, not an either/or.
Hyperloop should be an AND proposition to HSR, not an either/or.